Thanks for all the suggestions. It appears to be a
problem with disk block mapping even though LBA mode
is used. In light of the suggestions, this is what I
did today:

Use dd form /dev/zero to wipe MBR and start of disk.
Check Bios settings - AMI Bios set to "Auto" shows 
LBA mode and DMA, etc.

Downloaded June 10 snapshot and checked md5 sums.

Installed without problems. The installboot output
was:
boot: /mnt/boot
proto: /usr/mdec/biosboot
device: /dev/rwd0c
/usr/mdec/biosboot: entry point 0 proto bootblock
size 512
/mnt/boot is 3 blocks x 16384 bytes fs block shift 2;
part offset 63; inode block 24, offset 1704
using MBR partition 0: type 166 (0xa6) offset 63 (0x3f)

When I attempted to reboot from disk, the system hung at:
Searching for Boot Record from IDE-0..OK

The dmesg from the CD boot is:
OpenBSD 3.7-current (RAMDISK_CD) #686: Fri Jun 10 15:02:20 MDT 2005
    [EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/RAMDISK_CD
cpu0: AMD Duron(tm)  ("AuthenticAMD" 686-class, 64KB L2 cache) 1.62 GHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE
real mem  = 637050880 (622120K)
avail mem = 574648320 (561180K)
using 4278 buffers containing 31956992 bytes (31208K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(00) BIOS, date 04/09/04, BIOS32 rev. 0 @ 0xfdb10
pcibios0 at bios0: rev 2.1 @ 0xf0000/0x10000
pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xf7c90/192 (10 entries)
pcibios0: PCI Interrupt Router at 000:02:0 ("SIS 85C503 System" rev 0x00)
pcibios0: PCI bus #1 is the last bus
bios0: ROM list: 0xc0000/0x8000
cpu0 at mainbus0
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "SIS 741 PCI" rev 0x03
ppb0 at pci0 dev 1 function 0 "SIS 648FX AGP" rev 0x00
pci1 at ppb0 bus 1
vga1 at pci1 dev 0 function 0 "SIS 6330 VGA" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
pcib0 at pci0 dev 2 function 0 "SIS 85C503 System" rev 0x25
pciide0 at pci0 dev 2 function 5 "SIS 5513 EIDE" rev 0x00: 741: DMA, channel 0 
wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <WDC WD400BB-00DKA0>
wd0: 16-sector PIO, LBA48, 38166MB, 78165360 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5
atapiscsi0 at pciide0 channel 1 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <SAMSUNG, CD-ROM SH-152A, C503> SCSI0 5/cdrom 
removable
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2
"SIS 7012 AC97" rev 0xa0 at pci0 dev 2 function 7 not configured
ohci0 at pci0 dev 3 function 0 "SIS 5597/5598 USB" rev 0x0f: irq 10, version 
1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: SIS OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1 at pci0 dev 3 function 1 "SIS 5597/5598 USB" rev 0x0f: irq 10, version 
1.0, legacy support
usb1 at ohci1: USB revision 1.0
uhub1 at usb1
uhub1: SIS OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
ehci0 at pci0 dev 3 function 2 "SIS 7002 USB" rev 0x00: irq 10
usb2 at ehci0: USB revision 2.0
uhub2 at usb2
uhub2: SIS EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub2: 6 ports with 6 removable, self powered
sis0 at pci0 dev 4 function 0 "SIS 900 10/100BaseTX" rev 0x90: irq 10, address 
00:0b:6a:60:41:8a
rlphy0 at sis0 phy 1: RTL8201L 10/100 PHY, rev. 1
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
npx0 at isa0 port 0xf0/16: using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
biomask ffe5 netmask ffe5 ttymask ffe7
rd0: fixed, 3800 blocks
wd0: no disk label
root on rd0a
rootdev=0x1100 rrootdev=0x2f00 rawdev=0x2f02

Thanks for any suggestions.

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